Delete Section R313 "Automatic fire sprinkler systems" and replace
with the following:
"Per Section 67.281.1, RSMo., a builder of one- or two-family
dwellings or townhouses shall offer to any purchaser on or before
the time of entering into the purchase contract the option, at the
purchaser's cost, to install or equip fire sprinklers in the
dwelling or townhouse. Notwithstanding any other provision of law
to the contrary, no purchaser of such a one- or two-family dwelling
or townhouse shall be denied the right to choose or decline to install
a fire sprinkler system in such dwelling or townhouse being purchased
by any code, ordinance, rule, regulation, order, or resolution by
any county or other political subdivision. Any county or other political
subdivision shall provide in any such code, ordinance, rule, regulation,
order, or resolution the mandatory option for purchasers to have the
right to choose and the requirement that builders offer to purchasers
the option to purchase fire sprinklers in connection with the purchase
of any one- or two-family dwelling or townhouse. Any Governing Body
of any political subdivision that adopts the 2009 International Residential
Code for One- and Two-Family Dwellings or a subsequent edition of
such code without mandated automatic fire sprinkler systems in Section
R313 of such code shall retain the language in Section R317 of the
2006 International Residential Code for One- and Two-Family Dwellings
(R317.1) and Townhomes (R317.2)."
Section R302 Fire-resistent construction
R302.3 Two-family dwellings. Dwelling units in two-family dwellings
shall be separated from each other by wall and/or floor assemblies
having not less than one-hour fire-resistance rating when tested in
accordance with ASTM E 119. Fire-resistance-rated floor-ceiling and
wall assemblies shall extend to and be tight against the exterior
wall, and wall assemblies shall extend to the underside of the roof
sheathing.
Exceptions:
1. A fire-resistance rating of one-half (1/2) hour shall be
permitted in buildings equipped throughout with an automatic sprinkler
system installed in accordance with NFPA 13.
2. Wall assemblies need not extend through attic spaces when
the ceiling is protected by not less than five-eighths-inch (15.9
mm) Type X gypsum board and an attic draft stop constructed as specified
in Section R502.12.1 is provided above and along the wall assembly
separating the dwellings. The structural framing supporting the ceiling
shall also be protected by not less than one-half-inch (12.7 mm) gypsum
board or equivalent.
R302.3.1 Supporting construction. When floor assemblies are
required to be fire-resistance-rated by Section R302.3, the supporting
construction of such assemblies shall have an equal or greater fire-resistive
rating.
R302.2 Townhouses. Each townhouse shall be considered a separate
building and shall be separated by fire-resistance-rated wall assemblies
meeting the requirements of Section R302 for exterior walls.
Exception: A common two-hour fire-resistance-rated wall is permitted
for townhouses if such walls do not contain plumbing or mechanical
equipment, ducts or vents in the cavity of the common wall. Electrical
installations shall be installed in accordance with Chapters 34 through
42. Penetrations of electrical outlet boxes shall be in accordance
with Section R302.4.
R302.2.3 Continuity. The fire-resistance-rated wall or assembly
separating townhouses shall be continuous from the foundation to the
underside of the roof sheathing, deck or slab. The fire-resistance
rating shall extend the full length of the wall or assembly, including
wall extensions through and separating attached enclosed accessory
structures."